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Tammar had roared away from the park so fast that he had lost sight of the police car before losing control, Bannon claimed.

The crash occurred just 50 seconds after Tammar drove out of the park — “the blink of an eye,” Bannon said.

In another species the group has studied, the tammar wallaby, the backup’s development is paused to allow its older sibling to grow.

Tammar wallabies, which can grow to between 6 and 9 kilograms, are pregnant for just 26.5 days — barely longer than rats.

To determine whether the marsupial placenta functions similarly to a eutherian mammal placenta before birth, evolutionary biologist Julie Baker and evolutionary developmental biologist Michael Guernsey of Stanford University in California analysed the collection of genes expressed in the tammar wallaby’s placenta.